http://www.windowsbbs.com/pc-hardware/25139-acpi-pnp0501-1-com-1-problem.html

I take it you're converting from an old laptop with a serial port to a newer laptop with a USB to RS232 converter. Wide array of glitchiness with these converters. Contact World Electronics for the latest software and hardware upgrades.

It Don't mean a thing if it aint got that swing.

Cool, Free, Johnny Smith courtesy of NPR..HERE
http://www.npr.org/ramfiles/asc/asc25.smith.asx